Good Flame Retardancy Research Articles

A multifunctional polymeric additive with a synergistic effect for high-performance lithium-ion batteries.

A new type of tailor-made polymeric additive, poly(ethylene phosphate acrylonitrile), has been proposed as a multifunctional polymeric additive for endowing the carbonate electrolyte with synergistically regulated properties of good flame-retardance, enhanced Li-ion dissociation/transportation behavior and a stable LiFePO4 cathode electrolyte interphase (CEI) layer. Thus, an ultrahigh stable operation of 1500 cycles at the 20C-rate with a good discharge capacity is obtained.

A vanillin‐containing DOPO‐based compound for improving the flame retardancy of epoxy resin simultaneously with comparable transparency and mechanical property

AbstractA compound containing phosphorus/nitrogen/sulfur (named as DOVNPT) was synthesized by the reaction of p‐toluenesulfonamide, vanillin and 9,10‐dihydro‐9‐oxo‐10‐phosphophenanthrene‐10‐oxide, and was adopted to prepare flame retardant epoxy resins (FREPs) using 4,4‐diaminodiphenylmethane as the curing agent. The chemical structure of DOVNPT was verified using Fourier‐transform infrared spectroscopy, 1H and 31P nuclear magnetic resonance. The influence of the DOVNPT content on the thermal stability, fire performance, combustion behaviors, transparency and mechanical properties of the FREPs was investigated in detail. The DOVNPT promoted the decomposition of EP on advance whilst lowered the maximum decomposition rate. With the incorporation of 4 wt% DOVNPT (0.49 wt% phosphorus content), the FREP‐4 achieved a LOI value of 34.4% and a UL‐94 V‐0 rating. The FREP‐4 also gave the lowest peak heat release rate, total heat release and total smoke release, with a reduction of 40.4%, 24.8%, and 28.6% as compared with the pure EP, respectively. The comprehensive analysis of the char residues and gaseous pyrolysis products demonstrated that the DOVPNT displayed good flame retardant effect in both gas phase and condensed phase. Simultaneously, the FREPs presented a comparable transparency and slightly improved mechanical properties as compared with the pure EP.

A novel composite coating containing P/N/B and bio-based compounds for flame retardant modification of polyester/cotton blend fabrics

Herein, a novel composite coating containing P/N/B and bio-based compounds was developed and applied to the flame-retardant finishing of polyester/cotton (T/C) blend fabrics. The flame-retardant coating was prepared with a combination of triethanolamine borate, diethylenetriamine pentamethylene phosphonic acid and calcium alginate. The combined characterization of scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) proved that the coating system has been successfully processed to the surface of T/C blend fabrics. The results of limiting oxygen index (LOI), horizontal flammability test (HFT) and vertical flammability test (VFT) showed that the P/N/B/Ca-T/C blend fabrics obtained good flame retardancy and exhibited excellent char-forming ability. Meanwhile, the thermal stability and combustion behavior of the blend fabrics before and after coating were evaluated by thermogravimetric (TG) and cone calorimetry tests. Obviously, the flame-retardant coating transformed the thermal degradation process of T/C blend fabrics and suppressed their heat and smoke release during combustion. Furthermore, Fourier transform infrared (FTIR) spectroscopy of char layers and thermogravimetric-Fourier transform infrared spectroscopy (TG-IR) analysis indicated that the composite coating exerted flame retardancy to T/C blend fabrics in both the condensed and gas phases.

Development of Sustainable High Performance Epoxy Thermosets for Aerospace and Space Applications.

There is an imperative need to find sustainable ways to produce bisphenol A free, high performance thermosets for specific applications such as the space or aerospace areas. In this study, an aromatic tris epoxide, the tris(4-hydroxyphenyl)methane triglycidyl ether (THPMTGE), was selected to generate high crosslinked networks by its copolymerization with anhydrides. Indeed, the prepared thermosets show a gel content (GC) ~99.9% and glass transition values ranged between 167-196 °C. The thermo-mechanical properties examined by DMA analyses reveal the development of very hard materials with E' ~3-3.5 GPa. The thermosets' rigidity was confirmed by Young's moduli values which ranged between 1.25-1.31 GPa, an elongation at break of about 4-5%, and a tensile stress of ~35-45 MPa. The TGA analyses highlight a very good thermal stability, superior to 340 °C. The Limit Oxygen Index (LOI) parameter was also evaluated, showing the development of new materials with good flame retardancy properties.

Flame retardant polypropylene with a single molecule intumescent flame retardant based on chitosan

A single molecule intumescent flame retardant was synthesized through in-situ polymerization by chitosan-based ammonium polyphosphate microencapsulated by melamine-formaldehyde resin. The multiple reactive hydroxyl and amino groups in its molecular chain made it a positively charged polymer with excellent coordination. The decomposition of melamine-formaldehyde resin produced a large amount of incombustible gas, which reduced the heat absorption on the surface of the composite material and inhibited its decomposition. Through thermogravimetric analysis, it was found that its thermal stability was better at high temperatures. Due to the decomposition of melamine-formaldehyde resin, a large amount of incombustible gas was produced, which reduced the heat absorption on its surface and inhibited its decomposition, so that polypropylene composites containing the flame retardant had a smooth decomposition process. The burning results showed that the limiting oxygen index and vertical combustion grade of the polypropylene composites containing the flame retardant had been improved, which the vertical combustion rating was V-1, and the limiting oxygen index was 25.7%. At the same time, it was clearly observed that composites containing the single-molecule intumescent flame retardant had an excellent anti-dripping effect. The surface temperature of the composite material was greatly reduced during combustion, from 343.7 ℃ to 156.9 ℃. Raman spectra and SEM of the surface carbon layer of the burned spline revealed the composite containing the flame retardant with a lower ID/IG value, indicating that the carbon layer it formed had more excellent crystallinity. Therefore, its carbon layer had a better structure and stability. It could be borne out that our single-molecule intumescent flame retardant had a good flame retardant effect on PP.

Development of strong, tough and flame-retardant phenolic resins by using Acacia mangium tannin-functionalized graphene nanoplatelets

Constructing an eco-friendly phenolic resin with high toughness, strength, and flame retardancy is of great significance and challengeable in the wood-based panels industry. Acacia mangium tannin (AMT), as a biological macromolecule, was decorated onto graphene through ball milling. The formed AMT-functionalized graphene nanoplatelets (AMT@GnPs) were used to replace 40 % phenol to greenly modify and reinforce phenolic resins. The fabricated phenolic resin (BGTPF) exhibited high wet bonding strength of 1.58 MPa, high tensile strength of 24.4 MPa, and large toughness of 0.35 MJ m−3, which were 38.6 %, 27.7 %, and 75.0 % increments compared with the 1.14 MPa, 19.1 MPa and 0.20 MJ m−3 of the neat AMT-modified phenolic resin (TPF). These improvements were attributable to the good compatibility and strong interfacial interactions between AMT@GnPs and the resin matrix, which promoted the transfer and dissipation of load energy. The prepared BGTPF resin showed good flame retardancy and high thermal stability. The peak HRR decreased from 15.5 for TPF to 6.9 W/g for BGTPF. This work presents a new, low-cost, and sustainable strategy to construct mechanically strong, tough, and flame-retardant tannin-based phenolic resins for many promising applications such as engineered wood-based products.

Highly efficiency flame-retardant and anti-dripping performance with dual effect of phosphaphenanthrene-benzimidazole for poly (lactic acid) film

To improve the flammability and severe melt-dripping behavior of poly (lactic acid) (PLA), we designed and successfully synthesized a flame retardant structure (D-AB) based on phosphaphenanthrene and benzimidazole groups with hydrogen bonds and π-π stacking effect. Then, D-AB was blended with PLA in solution to prepare PLA/D-ABs films. The results showed that the incorporation of D-AB significantly enhances the viscoelasticity and complex viscosity of PLA due to the synergistic effect of hydrogen bonds and π-π stacking of D-AB. Meanwhile, with the good char formation ability of benzimidazole group, PLA/D-ABs exhibit excellent flame retardancy. With only a 5 wt % addition of D-AB, the PLA film with 0.15 mm thickness easily achieve UL-94 VTM-0 rating and high LOI value of 30.5%, while its melt-dripping behavior is improved. In addition, the flame retardant mechanism of D-AB in PLA is studied in detail. It is found that the release of PO· radicals and non-combustible gas in the gas phase, as well as the formation of a dense and intact carbon layers in the condensed phase contribute to the good flame retardant performance of D-AB. This work provides a method for designing highly efficient flame retardants for PLA.

Tailoring thermal and thermomechanical properties of biobased blends by hybridization of difuran benzoxazine with polysiloxane‐based benzoxazine and epoxy monomers

AbstractA difuran bio‐based benzoxazine (SA‐dfda) was synthesized by a three‐stage process from difurandiamine (DFDA) and 2‐hydroxybenzaldehyde with a final yield of 90%. Three copolymer systems were prepared by blending the difuran bio‐resin with epoxy resin (DGEBA), conventional benzoxazine (BA‐a), and polysiloxane‐based benzoxazine precursor [Pr(BA‐3aptms)] at different ratios. In order to study the effect of the renewable content on the main characteristics of the materials, thermal, thermomechanical, and morphological analyses were performed. The bio‐based benzoxazine/epoxy systems exhibited the lowest polymerization temperature with enhanced processability. However, the incorporation of epoxy slightly decreased the mechanical properties of materials. Bio‐based copolymers containing 5 wt%. of polysilsesquioxane precursor showed the highest glass transition temperatures, thermal stability, and char yields. All the copolymers exhibited good flame retardant properties as it was observed by their limiting oxygen index values (>21) and UL‐94 tests (V‐0 or V‐1). The copolymerization of bio‐based benzoxazines with different thermoset resins such as epoxy or benzoxazines can be used as a strategy to develop novel materials with tailor‐made properties.

Making polycarbonate flame retardant: Flame retardant selection and calorimetric analyses

Polycarbonate (PC) has been widely applied in aerospace and railway industries, and it is imperative to improve its fire safety related properties, especially heat release properties. Particularly, the MARHE value (maximum average rate of heat emission) directly obtained from the cone calorimeter (CONE) test is a comprehensive property that is presented in the EN45545-2 standard developed by the EU. In order to study the effect of flame retardants on the MARHE of polycarbonate, four flame retardants with different flame retardant mechanisms were used to prepare low heat release PC. CONE was used to characterize the heat release performance of PC, focusing on exploring the factors affecting MARHE and the method of preparing low heat release materials. The flame-retardant mechanism of PC was studied by SEM and TG/DTG. Meanwhile, the flame retardant index (FRI) is calculated as a reference for the flame retardant performance of PC. Results show the MARHE of HPCTP/PC is reduced by 31.12%, and it is confirmed that MARHE is influenced by time to ignition (TTI), peak heat release rate (PHRR), total heat release rate (THR), and the shape of the peak. Mica-RDP/PC materials were prepared based on the conclusions of MARHE derivation. RDP and Mica play a typical synergistic flame-retardant mechanism, with MARHE reductions from 20.31% to 20.00% of the single-component systems to 31.39%. All FRI values of PC materials are in the range of Good flame retardancy. This study provides a feasible way for the deep understanding and wide application of MARHE and the improvement of the fire safety performance of PC.

Bio-inspired and facile fabrication strategy of bio-based, halogen-free and superhydrophobic cotton fabrics with multi-functionality and durability

To satisfy the needs of cotton fabrics in the aspect of multi-functionality and durability, a layer-by-layer (LBL) decomposition technique was exploited, inspired by natural superhydrophobicity. Significantly, an intumescent flame retardant system consisting of bio-based phytic acid (PA) and polyethyleneimine (PEI) was used to improve the flame retardancy of cotton fabrics. Then, polydimethylsiloxane (PDMS) was deposited to reduce the surface energy of cotton fabrics, which endows the superhydrophobic properties of cotton fabrics with low adhesion. The results have shown that the water contact angle and sliding angle of as-prepared cotton fabrics reach 154° and 8°, respectively. Most of all, the multifunctional cotton fabrics have also achieved excellent self-cleaning and oil-water separation function with excellent durability and stability, which can maintain the superhydrophobicity after 24 h strong acid and alkali corrosion tests, 360 cm abrasion distance, 5 times oxygen plasma etching-restoration cycles, 5 times laundry tests, 22 times tape adhesive-peel tests and knife cutting tests. Moreover, superhydrophobic cotton fabrics exhibited good flame retardancy with self-extinguishing ability. Therefore, the superhydrophobic cotton fabrics have exhibited the characteristics of robust, environmental protection, environmental friendliness, low cost and easy preparation, which provided a feasible strategy for all-weather superhydrophobic needs in extreme environments, especially in firefighting uniforms and scenarios with high fire safety requirements.

An Itaconic Acid‐Based Phosphorus‐Containing Oligomer Endowing Epoxy Resins with Good Flame Retardancy and Toughness

AbstractWith the aim to reduce the influence of flammability and brittleness of epoxy resin (EP) on its applications, a phosphorus‐containing oligomer (BID) containing phosphophenanthrene group and flexible chain segment is designed and applied to methyltetrahydrophthalic anhydride (MeTHPA) curing EP systems. Compared with EP/MeTHPA, the glass transition temperature (Tg) declines after introducing BID. But the addition of BID endows EP/MeTHPA with good flame retardancy. When the dosage is only 19.2 wt.%, the limiting oxygen index (LOI) of EP/BID/MeTHPA increases by 77% to 36% (P content: 1.5 wt.%) compared with EP and reaches the vertical combustion (UL‐94) V‐0 rating. Cone calorimetry (CC) results reveal that PHRR and THR drop by 40% and 31%. The pyrolytic process and char residue data analysis show that BID plays flame‐retardant role in gas phase and condensed phase. In addition, impact and flexural and tensile strength improve by 84%, 19% and 54% individually, proving that BID holds a potential on enhancing mechanical performance of EP/MeTHPA.

Broadband absorption of macro pyramid structure based flame retardant absorbers

• A flame retardant and microwave absorbing carbon nanotube/ammonium polyphosphate composite is prepared by a simple process. • The wave transparent flame retardant coating ensure the flame retardant and absorbing material not be ignited under open fire. • The the maximum absorption bandwidth can reach 14.36 GHz by the pyramid structure. • The designed pyramid structure can ensure the absorption bandwidth of 14 GHz at the incident angle within 60°. Flame-retardant materials with good electromagnetic wave absorption play an increasingly important role in Over-the-Air (OTA) tests in microwave anechoic chambers. In this work, carbon nanotubes and ammonium polyphosphate (CNTs@APP) composite were prepared by crosslinking with the silane coupling agent (KH550). The flame retardancy is improved with the increase of APP. However, the microwave absorption performance (MAP) and processing difficulty changed greatly as well. Therefore, magnesium aluminum double-layer metal hydroxide (LDH) was obtained by coprecipitation method and processing into the coating, so as to realize flame retardancy which reaches the limiting oxygen index (LOI) of 24.8% and good MAP at the same time. Then, a high-frequency structure simulator (HFSS™) was used to simulate the pyramid model to realize the broadband absorption, and the optimal parameter range was obtained, that is, when the total height of the material is 40 mm, the height of the base accounts for 1/5–1/3, and the tangent of the half top angle is near 1/5, which result in the best MAP. Finally, the broadband absorption of 14.36 GHz (3.64–18 GHz) was realized when the base height is 1/3, and the broadband absorption of 14 GHz (4–18 GHz) can be realized under the condition of large-angle oblique incidence of 0°–60°. Based on the pyramid structure of flame retardant absorbers, the obtained samples possess both good flame retardancy and microwave absorption, which show great application prospects in the field of OTA test, broadband microwave absorption performance, and brodaband oblique incidence absorption.

Biomass-based epoxy resin derived from resveratrol with high temperature resistance and intrinsic flame retardant properties

Preparing biomass-based epoxy resin with high temperature resistance and flame retardancy is still an appealing yet challenging task. Now, a high-temperature resistant and flame-retardant resveratrol-based epoxy (RESEP) has been synthesized through a facile one-step method. The structure of RESEP was established using FTIR and NMR spectroscopy. RESEP and petroleum-based epoxy diglycidyl ether of bisphenol A (DGEBA) were each cured with 4,4-diaminodiphenyl methane (DDM) to prepare RESEP/DDM and DGEBA/DDM. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile testing, thermogravimetric analysis (TGA), thermogravimetric analysis-infrared spectroscopy (TG-IR), scanning electron microscopy (SEM), limiting oxygen index (LOI) and the UL-94 vertical burning test were used to systematically evaluate the properties of RESEP and RESEP/DDM. The glass transition temperature (Tg) of RESEP/DDM is 335 ℃, which is significantly higher than that of DGEBA/DDM (168 ℃). In addition, RESEP/DDM displays good thermogravimetric performance and flame retardancy. Typically, it displays a UL-94 V-0 rating, an LOI value was as high as 31.8%, and a char yield as high as 38.6% (800 ℃). The results reported indicate the possibility of preparing biomass-based epoxy resin with high temperature resistance, flame retardancy and mechanical properties, which is potential to be utilized in the fields of electronics and aerospace.

Versatile Light-Mediated Synthesis of Dry Ion-Conducting Dynamic Bottlebrush Networks with High Elasticity, Interfacial Adhesiveness, and Flame Retardancy

Dry ion-conducting elastomers possess superior reliability in soft ionotronic devices when compared to ion-conducting gels that suffer from liquid evaporation or leakage issues. Recent works have shown that bottlebrush architecture can effectively reduce structural relaxation time so that the bottlebrush polymers have concentrated charge carriers and high chain mobility that result in good ionic conductivity and mechanical flexibility. Here, we report a novel and versatile light-mediated strategy for synthesizing dry ion-conducting elastomers with dynamic bottlebrush network structures. The obtained dry ion-conducting dynamic bottlebrush networks (DICDBNs) are colorless and highly transparent and can be simply patterned. We systematically investigate the influence of the number and length of the side chains in the DICDBNs on the physicochemical properties of the resultant materials and find that the optimized DICDBNs have high room-temperature ionic conductivity (2.05 × 10–4 S cm–1), good elasticity (stretchability 923%, 83.3% toughness recovery after 100 uninterrupted strain cycles at a strain of 300%), outstanding healing ability (healing efficiency 90.5%), on-demand degradability, excellent interfacial adhesiveness, good flame retardancy, and strain and temperature dual sensitivity, making them promising candidates for multifunctional wearable ionotronics.

Thermal stability, pore structure characteristics of char layer and ablation resistance mechanism of new thermal insulation composites based on polyphosphazene polymer

Polyphosphazene (PDPP) composites have emerged as a hot research topic in the field of low-density composite insulation materials because of their good thermal stability and flame retardancy. In this study, the ablative properties and mechanism of PDPP composites reinforced by fiber and functional fillers are studied. The test results show that PDPP composites have good thermal stability and oxidation resistance. The results of the oxyacetylene ablation test show that PDPP composites has strong ablation resistance, and its char layer has high structural strength, as well as high bonding strength with the material matrix. However, the thermal insulation performance of PDPP composites is weak. Based on the physical and chemical analysis of the composite material and the char layer, it is concluded that the excellent ablation resistance is mainly due to the high strength of the char layer, which bnefits from high char yield of polyphosphazene polymer and the formation of silicon phosphate. However, the high thermal conductivity of composite and char layer lead to poor thermal insulation performance.

Effect of compound system of bifunctional flame-retardant based on DOPS/phosphazene structure and ammonium polyphosphate on flame retardancy of epoxy resin

In order to obtain a flame-retardant epoxy resin (EP) composite with good flame retardancy, ammonium polyphosphate (APP) was applied to EP in combination with hexa-(4-(9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-sulfide)-hydroxymethylphenoxy)cyclotriphosphazene (HAP-DOPS). The experimental results showed that the flame retardancy of EP composite can be improved effectively when HAP-DOPS was compounded with APP and added to EP. Under the premise condition of the phosphorus content in the system was 1.6% and m HAP-DOPS: m APP = 1.5:1, the LOI value reached 30.0% and the vertical burning test reached UL94 V-0 rating, at which point the flame retardancy of the compound system was optimal. Compared with HAP-DOPS/EP, the thermal stability of HAP-DOPS/APP/EP was improved, and the char residues were increased; the total heat release (THR) was decreased by 40.66%, and the total smoke release (TSR) was decreased by 34.13%. And the flexural strength and tensile strength were increased by 32.52% and 14.46%, respectively. The study of flame-retardant mechanism showed that the addition of HAP-DOPS/APP to EP can promote the formation of phosphorus-rich char residues, which mainly played a flame-retardant role in the condensed phase and in the gaseous phase by releasing noncombustible NH3.

N-substituted cyclic phosphoramides as flame-retardant and anti-dripping coatings for PET fabric

Fabric made of polyethylene terephthalate (PET) is a common textile that is widely used in daily life. Its flame retardancy has emerged as a major concern for lowering the risk of fire. As a kind of popular flame retardants, cyclic phosphoramides have been widely applied to improve the flame retardancy of various inflammable materials. To achieve more suitable and effective flame retardants for PET fabric, the fire-safety capabilities of PET fabric coated with various cyclic phosphoramides substituted by siloxane (PDPTP), hydroxyphenyl (DPHBP), and hydroxyethyl (PDNP) groups was explored in this work. All of these chemicals can successfully prevent PET fabric from melting and burning, providing it good flame retardancy and non-dripping performance. LOI values for PET fabrics coated with PDPTP, DPHBP and PDNP increased to 24.6, 25.2, and 30.3% under comparison loadings. These flame-retardant coatings enhanced the char-forming capacity for PET fabric. The residues at 700 °C increased to 26.5 and 27.4% for PDPTP and PDNP coated fabric in N2 atmosphere compared with 2.9% for pure fabric. Peak heat release rate (PHRR) and total heat release (THR) was effectively restrained by 50% and 35%, respectively. Fortunately, these flame-retardant coatings had no detrimental effects on the mechanical characteristics of PET fabric and even enhanced the weft's tensile breaking forces. Apart from DPHBP significantly reducing the fabric's whiteness, the whiteness of PDPTP and PDNP coated PET fabric hardly changed. The effect of cyclic phosphoramides with various substitutions on the flame retardancy of PET fabric is thoroughly discussed in this paper, which might be useful in the development of more effective flame retardants for PET materials.

Polyelectrolyte as highly efficient flame retardant to epoxy: Synthesis, characterization and mechanism

To balance the flame retardancy and mechanical properties of epoxy (EP) resin, a polyelectrolyte complex (PPA-PEI, P content of 9.27%) was facilely prepared in aqueous solution by the neutralization reaction between polyethyleneimine (PEI) and phenyl phosphonic acid (PPA). Just 4 wt% PPA-PEI could endow the relating EP composite with satisfied flame retardancy (limited oxygen index (LOI) of 29.0%, UL-94 V-0 rating). It also shows significant reduction in total heat release (THR), peak heat release (PHRR), total smoke production (TSP) of 52.5%, 52.3%, and 22.7%, respectively. Analyzed from the char morphologies and chemical structures, it can be induced that the good flame retardancy is mainly attributed to the highly yielded char residue with well swelled and multicellular structures possessing good barrier and thermal insulation properties. Meanwhile, the dilution and free radical scavenging effects also work well in the gaseous phase. Before the PPA-PEI molecules start to collapse into cluster seriously to worsen the dispersability within EP matrix, EP/4 wt%PPA-PEI can maintain similar tensile strength and glass transition temperature (Tg), and display improved Yong's and storage modulus compared with neat EP. Accordingly, this presented work provides a low-cost and promising approach for preparing flame-retardant EP/PEC composites with excellent comprehensive performance.

Achieving high flame retardancy, crystallization and biodegradability PLA based on 1 wt% addition of novel fully bio-based flame retardant

In this paper, a bio-based flame retardant PA-AR is synthesized, which endows PLA with good flame retardant and crystallization properties, and at the same time promotes the biodegradability of PLA. Only 1 wt% PA-AR makes the LOI value of PLA reach 26.8% and reaches UL-94 V-0 level. In addition, 1 wt% PA-AR increases the crystallinity of PLA to 23.4%, which increased by 460% compared with PLA. Further, due to the increase of crystallinity, the tensile strength is also improved. Besides, the addition of PA-AR can greatly promote the degradation performance of PLA under specific biological conditions. This work proposed a novel method to obtain completely biodegradable flame retardant composites.

An eco-friendly and intumescent P/N/S-containing flame retardant coating for polyamide 6 fabric

This study focused on the construction of an eco-friendly and intumescent flame retardant (FR) coating for polyamide 6 (PA6) fabric. The intumescent FR coating, consisting of phytic acid, pentaerythritol and thiourea, was deposited onto PA6 fabric through dip-coating technique. The FR performance, anti-dripping ability, thermal stability, combustion behavior and mechanical property of the coated PA6 fabrics were explored. The severe dripping of coated PA6 fabric was totally eliminated, achieving an excellent FR performance at a low P (2.2%) and S (3.4%) content. Correspondingly, the LOI increased to 28.8% versus 23.2% of pristine one, displaying good flame retardancy. The char residue analyses confirmed the intumescent FR behavior of coated PA6 fabrics. The intumescent char layer played a major role in isolating the exchange of combustibles, oxygen and heat, leading to the significant reduction in heat release performance. The results of cone calorimetry test showed that the peak heat release rate and average effective heat of combustion of coated PA6 fabric decreased by about 36.5% and 34.4%, respectively versus pristine one. Meanwhile, the sulfur-based gases captured free radicals to interrupt the continuous combustion, leading to the significantly improved flame retardancy. Furthermore, the FR coating exerted little influence on the mechanical performance of PA6 fabric.